Abstract
Received : January 2001 A field experiment was conducted during 1996 99 at Ghaghraghat, Bahraich, to study the energy requirement, yield, water use and economics of 7 rice (Oryza sativa L.) based cropping systems in flood prone areas. Rice lentil (Lens culinaris Medikus) maize (Zea mays L.) fodder cowpea [Vigna unguiculata (L.) Walp.] system gave significantly highest rice equivalent yield (95.82 qlha), water use efficiency (83.83 kg graintha cm), net profit (Rs 30,2491 , ha), benefit : cost ratio (3.35) and production efficiency (Rs 75.02ldaylha) compared with rest of cropping sequences. Rice wheat (Triticum aestivum L. emend. Fiori Paol.) maize cowpea (F) sequence ranked second with regards to net profit, rice equivalent, water use efficiency and production efficiency. Rice pea (Pisum sativum L., s.1) maize cowpea (F) system gave the highest energy input (38.02 MJ x 1O31ha) while the highest energy output (907.75 MJ x 103/ha) and energy use efficiency (29.52) were obtained in rice Indian mustard [Brassica juncea (L.) Czernj. Cossonl maize cowpea (F) sequence. Land utilization efficiency was the maximum (91.78%) in rice linseed (Linum usitatissimum L.) maize cowpea (F), followed by rice lentil maize cowpea (F) system (90.41%).
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